Circumferentially Short-circuited Circular Sector Patch Antenna with Broadened Beamwidth

Mao, Xiaohui; Ji, Fei-Yan; Gu, Shi; Yu, Jian; Lu, Wen‐Jun

doi:10.1109/aps/ursi47566.2021.9704739

Cited by 6 publications

(4 citation statements)

References 4 publications

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“…The normalized radius of the patch can be estimated by the length of the equivalent magnetic dipole and the roots of the zero-order Bessel function [35], [36]: On one hand, according to the asymmetric boundary condition at , (i.e., , ; and , ), the length of the prototype magnetic dipole should thus satisfy , as shown in (2a), where is the length of equivalent magnetic dipole [37]. The radius of the cavity model can be estimated by (2b).…”

Section: Dual-resonant Design Approachmentioning

confidence: 99%

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Dual Radial-Resonant Wide Beamwidth Circular Sector Microstrip Patch Antennas

Mao

et al. 2023

Chinese J. Elect.

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In this article, a design approach to a radial-resonant wide beamwidth circular sector patch antenna is advanced. As properly evolved from a U-shaped d ipole, a prototype magnetic dipole can be fit in the radial direction of a circular sector patch radiator, with its length set as the positive odd-integer multiples of onequarter wavelength. In this way, multiple modes resonant circular sector patch antenna with short-circuited circumference and widened E-plane beamwidth can be realized by proper excitation and perturbations. Prototype antennas are then designed and fabricated to validate the design approach. Experimental results reveal that the E-plane beamwidth of a dual-resonant antenna fabricated on air/Teflon substrate can be effectively broadened to 128°/120°, with an impedance bandwidth of 17.4%/7.1%, respectively. In both cases, the antenna heights are strictly limited to no more than 0.03guided wavelength. It is evidently validated that the proposed approach can effectively enhance the operational bandwidth and beamwidth of a microstrip patch antenna while maintaining its inherent low profile merit.

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Section: Dual-resonant Design Approachmentioning

confidence: 99%

“…In the single-mode resonant case [38], the normalized radius can be calculated by (3). In the dualresonant case, the radius of the circular sector patch can be alternatively estimated by (4) [37].…”

Section: Dual-resonant Design Approachmentioning

confidence: 99%

Dual Radial-Resonant Wide Beamwidth Circular Sector Microstrip Patch Antennas

Mao

et al. 2023

Chinese J. Elect.

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“…As it can be seen, the antenna is composed of a low-band antenna with L-shaped slots, sixteen high-band antennas, plastic poles and a reflector. The low-band antenna is consisted of two vertical dipoles [14] with integrated baluns. The vertical dipoles are printed on Rogers ro4350 dielectric substrates ( = 3.66, = 0.004) with a thickness of 0.762 mm and Their geometry and dimensions are presented in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, TCM has been widely applied in many novel antenna developments. Typical applications of characteristic modes include mobile phone antennas [11] , platform integrated antennas [12] , low scattering antennas [13] , and bandwidth enhancement [14,15] . However, the TCM is rarely applied for shared-aperture base station antenna arrays about cross-band mutual coupling analysis.…”

Section: Introductionmentioning

confidence: 99%

High‐Order Characteristic Modes Suppression for Cross‐Band Decoupling in Shared‐Aperture Antenna Array

Lu¹,

CHEN²,

SHEN

et al. 2022

Chinese J of Electronics

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In dual-band shared-aperture base station antennas, the secondary radiation (SR) field caused by cross-band couplings always leads to radiation pattern distortion. In this work, the SR field caused by the coupling is attributed to the excitation of the target highorder modes from the perspective of the characteristic mode. To effectively suppress the target modes, L-shaped slots are proposed to load the arms of the radiator and altering the current paths. As compared with conventional dipoles without L-shaped slots, the proposed antenna generates less SR field. Therefore, the radiation pattern of the high-band antennas keeps stable in a dual-band shared-aperture antenna array environment. Prototype of a dual-band antenna array consisting of the proposed lowband (LB) antenna and a 4 × 4 high-band (HB) antenna array is fabricated. Simulated and measured results show that the designed dual-band array operates at both 0.74-0.82 GHz and 3.30-3.80 GHz. The experimental results verify that the cross-band decoupling has been achieved with the high-order mode suppression.

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Triple‐mode resonant null frequency scanning antenna with positive scanned slope

Mao

et al. 2022

Int J RF Mic Comp-Aid Eng

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A novel design approach to triple‐mode resonant null frequency scanning antenna (NFSA) with positive scanned slope is proposed. Firstly, a circular sector patch radiator with short‐circuited circumference is introduced to generate multiple TM0m (m = 1, 2, …) mode resonances. Then, as theoretically predicted and numerically proved, the first three TM0m (m = 1, 2, 3) modes can be effectively combined to yield null frequency scanning functionality with positive scanned slopes. Next, a prototype antenna is designed, fabricated, and measured. As numerically demonstrated and experimentally validated, the proposed NFSA can exhibit a null frequency scanning functionality in xz‐plane with positive scanned slope ranging from θ = −90° to +45° (for null depth smaller than −10 dB) within a fractional impedance bandwidth of about 34.3% (i.e., 2.97‑4.20 GHz).

show abstract

Circumferentially Short-circuited Circular Sector Patch Antenna with Broadened Beamwidth

Cited by 6 publications

References 4 publications

Dual Radial-Resonant Wide Beamwidth Circular Sector Microstrip Patch Antennas

Dual Radial-Resonant Wide Beamwidth Circular Sector Microstrip Patch Antennas

High‐Order Characteristic Modes Suppression for Cross‐Band Decoupling in Shared‐Aperture Antenna Array

Triple‐mode resonant null frequency scanning antenna with positive scanned slope

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